Method of Diplandroid Formation and Yield of Progeny from Reciprocal (4x-2x) Crosses1

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Abstract
In 6 families of reciprocal crosses involving 3 tetraploid (2n = 4x = 48) cultivars (‘Wis. 639’, ‘Merrimack’, and ‘Superior’) and 3 diploid (2n = 2x = 24) Phureja-haploid hybrids (W5293.3, W5295.7, and W5845.1), significantly higher tuber yields were obtained in 1970 in families only when the 2x clone W5295.7 was the female parent. The differences in yield in the progeny of these reciprocal crosses were attributed to the mode of 2n gamete formation, since of the 2x clones used, only W5295.7 forms diplandrous gametes by first division restitution. In 1971 with the same materials at 2 locations, significantly higher tuber yields were obtained only in the progeny of 4x × 2x crosses with W5295.7 as the pollen source. These results agree with the hypothesis that the method of diplandroid (2n pollen) formation is responsible for differences in yields of the progeny from reciprocal crosses. Data agreeing with this hypothesis resulted from reciprocal crosses involving four 4x cultivars (‘Kennebec’, ‘Katahdin’, ‘Platte’, and ‘Wis 231’) and two 2x clones (W5295.7 and W5293.3). The progeny from these reciprocal crosses were tested for yield in 1971 and 1972. Differences in yield from progeny of reciprocal crosses again were obtained only with the 2x clone W5295.7 which forms diplandroids by first division restitution.

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